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Grey's Anatomy Season 7 Episode 4: "Can't Fight Biology" Quotes

Derek: I love you and you love me. And whatever happens, I don't care. I don't want to know. I mean it. I don't want to know. Meredith: Well the lab already has my blood so..Derek: Here's what we're gonna do. No more doctors, no more labs. You and I we have a lot of sex. Maybe we make a baby, maybe we do not. Maybe you get Alzheimer's, maybe you do not. Just screw the odds, screw science. Let's just live. Whatever happens. Happens. Me and you. Okay?Meredith: Okay. Derek: Okay!

Cristina: Why would you want to put yourself through this again?Her patient: Because I love what I do more than anything. You don't find something you love that much and let it go. You hold onto it and throw yourself in deeper.

Biology says that we are who we are from birth. That are DNA is set in stone. Unchangeable. Our DNA doesn't account for all of us though, we're human. Life changes us. We develop new traits. Become less territorial. We start competing. We learn from our mistakes. We face our greatest fears. For better or worse, we find ways to become more than our biology. The risk of course is that we can change too much to the point where we don't recognize ourselves. Finding our way back can be difficult. There's no compass, no map. We just have to close our eyes, take a step, and hope to God we get there.

Meredith: I need you to take my blood.Cristina: For what? Meredith: So I can get tested for the Alzheimer's gene. I mean it's time I know one way or the other. What's a little Alzheimer's too?Cristina: Alright. This is a lot bigger than a baby step. Meredith: Just do it before I change my mind.Cristina: Okay.

Arizona: Mark stares at my boobs when we talk. He starts at my face, but somewhere along the way he gets distracted and ends up at my boobs. I love guys. I love them. But I've tried my whole life to avoid the boob staring guy. Biology even helped me by making me gay. But now, my girlfriend's best friend is that guy. And I don't think I need to apologize for the fact that the only person I want staring at my boobs is you. Callie: Boobs, really, you're making this about boobs?Arizona: He stares at them. Callie: 'Cause their good boobs!

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Biology determines much of the way we live. From the moment we're born we know how to breathe and eat. As we grow older new instincts kick in. We become territorial. We learn to compete. We seek shelter. Most important of all, we reproduce. Sometimes biology can turn on us though. Yeah, biology sucks sometimes.